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1997-12-22 - Re: Is Anonymous Communication only for “Criminals”?

Header Data

From: ichudov@Algebra.COM (Igor Chudov @ home)
To: tcmay@got.net (Tim May)
Message Hash: 9c27d65e71c034875d4e271875bc8ce0891bb8ed4c677c7ee171daf9a568e792
Message ID: <199712220308.VAA01679@manifold.algebra.com>
Reply To: <v0310280bb0c1b61aa9c3@[207.167.93.63]>
UTC Datetime: 1997-12-22 03:15:44 UTC
Raw Date: Mon, 22 Dec 1997 11:15:44 +0800

Raw message

From: ichudov@Algebra.COM (Igor Chudov @ home)
Date: Mon, 22 Dec 1997 11:15:44 +0800
To: tcmay@got.net (Tim May)
Subject: Re: Is Anonymous Communication only for "Criminals"?
In-Reply-To: <v0310280bb0c1b61aa9c3@[207.167.93.63]>
Message-ID: <199712220308.VAA01679@manifold.algebra.com>
MIME-Version: 1.0
Content-Type: text



Tim May wrote:
> (Even the _ability_ to block a pay phone, qua pay phone, must imply that
> pay phones send out some kind of signal announcing themselves as pay
> phones, which I had not heard of before. I assumed a pay phone was Just
> Another Phone Number.)

Telephone switches generate (receive) a digit that is known as Call Type.
Simplistically, Call Types may be 1+ for regular calls, 800 for 800 calls,
Conference, and 0+ for operator/payphone call.

One of the switch features may be some kind of call type blocking,
or passing the call type to the termination side, such as the pager
company computer.

	- Igor.

Thread